Are the forum categories set? I find the current categories a little non-intuitive, for example, if I have a question where does that go? Maybe in recipes if it's about a ChefSteps recipe, but if it's more general or about a technique? Seems like the correct category is ''unstable'' in the post content: similar posts might belong in other categories.
An alternative idea (not obviously better) would be to separate by post purpose: "ask a question," "share what you've made," "non-culinary," and so forth. Within each group there might be further breakdown, e.g. questions could include a section for gear questions, one for food science questions, and so forth.
Then again, this may be overcomplicated...